package 数组;


import java.util.Scanner;

public class Main_704 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int target = scanner.nextInt();
        int[] nums = new int[6];
        for (int i = 0; i < nums.length; i++) {
            nums[i] = scanner.nextInt();
        }
        System.out.println(search(nums, target));
    }

    private static int search(int[] nums, int target) {
        int left = 0;
        int right = nums.length - 1;
        while (left <= right) {
            int mid = left + (right - left) / 2;
            // int mid = (left + right)/2;
            if (nums[mid] > target) {
                right = mid - 1;
            } else if (nums[mid] < target) {
                left = mid + 1;
            } else {
                return mid;
            }
        }
        return -1;
    }
}




